I have tried the single Office Bag pannier, and returned it. It looks great and the quality of the bag itself is good. Also the size is just large enough to fit a Macbook air, so it's a good option for bikes with short chainstays if you are worried about heel strike. However, the mounting system was unacceptable for me: leather straps with snap closure. Not only does it strike me as insufficiently secure, but it's also not very easy to get on/off.